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Old 16th May 2009, 23:16   #15  |  Link
mikenadia
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Join Date: Nov 2007
Posts: 246
Smelling Catmull-Rom36 or Bicubicresize36
Code:
From madshi:Great! yesgrey3 earlier reported that "Akima" splines may be interesting. 
I haven't been able to turn that documentation into a 
coefficient set that I could use for my resampling filters...
http://www.fugroairborne.com/resourc...ension_III.pdf

on page 4: equations 2 to 5 .
This will allow you to only interpolate between points 2 and 3.

Another one is the constrained spline (with different derivatives at endpoints) described in
http://www.korf.co.uk/spline.pdf (interesting because no need to solve a system of equations)

Other ideas (preserving convexity over C1 continuity , locally monotonous constraint...) in
http://math.lanl.gov/~mac/papers/numerics/H83.pdf

Last edited by mikenadia; 20th May 2009 at 01:54.
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